*/
    protected void processDefault(final Object... objs) {
    }

    /**
     * Processes system error log events.
     *
     * @param objs the log objects (should contain a Throwable)
     */
    protected void processSystemError(final Object... objs) {
        final Throwable t = (Throwable) objs[0];
        if (logger.isErrorEnabled()) {
            logger.error("System Error.", t);

            assertTrue("Content should contain stack trace elements", content.contains("\tat "));

        } finally {
            // Clean up
            Files.deleteIfExists(tempFile);
        }
    }

    public void test_writeThreadDump_withInvalidPath() {
        // Test with invalid file path (directory that doesn't exist)

        assertTrue("Should contain all keys", Arrays.asList(keys).contains("lang"));
        assertTrue("Should contain all keys", Arrays.asList(keys).contains("a_key"));
        assertTrue("Should contain all keys", Arrays.asList(keys).contains("b_key"));
        assertTrue("Should contain all keys", Arrays.asList(keys).contains("c_key"));
    }

    public void test_entrySet_with_only_lang_key() {

        assertTrue(str.contains("count="), "Should contain count");
        assertTrue(str.contains("offset="), "Should contain offset");
    }

        assertTrue(infoString.contains("alloc=1000"), "toString should contain alloc");
        assertTrue(infoString.contains("free=500"), "toString should contain free");
        assertTrue(infoString.contains("sectPerAlloc=100"), "toString should contain sectPerAlloc");
        assertTrue(infoString.contains("bytesPerSect=512"), "toString should contain bytesPerSect");
    }

        assertTrue(resultString.contains("status=0"), "toString should contain the status.");
        assertTrue(resultString.contains("converter=13330"), "toString should contain the converter.");
        assertTrue(resultString.contains("entriesReturned=2"), "toString should contain the number of entries.");
        assertTrue(resultString.contains("totalAvailableEntries=5"), "toString should contain the total available entries.");
    }

        assertEquals(1, pairs.size(), "Should have 1 pair after removal");
        assertFalse(AvPairs.contains(pairs, AvPair.MsvAvFlags), "Should not contain MsvAvFlags");
        assertTrue(AvPairs.contains(pairs, AvPair.MsvAvTimestamp), "Should still contain MsvAvTimestamp");
    }

    /**
     * Test remove method with non-existing type
     */
    @Test

        String s = session.toString();
        assertTrue(s.contains("accountName="), "toString should contain accountName");
        assertTrue(s.contains("primaryDomain="), "toString should contain primaryDomain");
        assertTrue(s.contains("uid="), "toString should contain uid");
    }

        String ts = ex.toString();
        assertTrue(ts.contains("SmbUnsupportedOperationException"), "toString should contain class name");
        if (msg != null) {
            assertTrue(ts.contains(msg), "toString should contain provided message");
        } else {
            assertFalse(ts.contains(":"), "toString should not contain ':' when message is null");
        }
    }

    @Test

Let's first see how the normal API app would look like before adding the callback.

It will have a *path operation* that will receive an `Invoice` body, and a query parameter `callback_url` that will contain the URL for the callback.

This part is pretty normal, most of the code is probably already familiar to you:

{* ../../docs_src/openapi_callbacks/tutorial001.py hl[9:13,36:53] *}

/// tip